The invention relates to a sliding support plate for winding of a vertical winding machine of a transformer coil. The sliding support plate is arranged on a disc of the vertical winding machine and is provided with a bottom plate, a sliding block, a vertical pipe and an upper support plate, wherein the sliding block is fixed to a lower end face of the bottom plate; the vertical pipe is vertically arranged on an upper end surface of the bottom plate, the upper support plate is fixedly arranged at an upper end part of the bottom plate, a sliding groove is formed in the disc of the vertical winding machine in a radial direction, and the sliding support plate is arranged in the sliding groove in a sliding way by the sliding block. By the sliding support plate for winding of the vertical winding machine of the transformer coil, coil winding of a product with relatively large diameter is solved, the labor efficiency is greatly improved, labor time and cost are reduced, meanwhile, the device utilization ratio is improved, the product fabrication period is shortened, and the sliding support plate has universality in coil winding of different products.